package org.smart4j.framework.helper;

import org.smart4j.framework.util.ReflectionUtil;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * Bean 助手类
 *
 * Created by chinalin on 2017/3/15.
 */
public final class BeanHelper {

    /**
     * 定义 Bean 映射Map(用于存放 Bean 类与 Bean 实例的映射关系)
     */
    private static final Map<Class<?>, Object> BEAN_MAP = new HashMap<Class<?>, Object>() ;

    static {
        Set<Class<?>> beanClassSet = ClassHelper.getBeanClassSet();
        for (Class<?> beanClass : beanClassSet){
            Object obj = ReflectionUtil.newInstance(beanClass) ;
            BEAN_MAP.put(beanClass, obj) ;
        }
    }

    /**
     * 获取 Bean 映射Map(key:class,value:对象)
     */
    public static Map<Class<?>, Object> getBeanMap() {
        return BEAN_MAP;
    }

    /**
     * 获取 Bean 实例(对象)
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(Class<T> cls){
        if (!BEAN_MAP.containsKey(cls)){
            throw new RuntimeException("can not get bean by class:" + cls) ;
        }
        return (T) BEAN_MAP.get(cls) ;
    }

    /**
     * 设置 Bean 实例
     */
    public static void setBean(Class<?> cls,Object obj){
        BEAN_MAP.put(cls,obj) ;
    }
}
